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Let’s take a look at how to do that with a text field that is only supposed to have a value of either ‘AAAA’ or ‘BBBB’ (yes, I know that this does not make much sense in a real PDF form).

So, if the user enters ‘01234’ we should see an error message that would instruct the user about what type of data is valid for this field.

Required fields in an interactive PDF form are displayed with a red border in PDF Studio.

When a form is submitted, PDF Studio will display an error message if any required field is empty.

The signer's identity is trusted and the document has not been changed. The signature has not yet been validated and the document has not been updated since signed.Data validation rules can be defined and designed using any of various methodologies, and be deployed in any of various contexts.Data that does not conform to these rules will negatively affect business process execution.In the latter case, we set rc to false, and also display an error message.When you play around with the function, you’ll notice that the validation function is only called when the focus leaves the field, so you have to click outside of the field to actually make that error message pop up.

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